Golf is a very interesting sport played in fields filled with green. When coloring pictures related to golf you can use a lot of green to show the green field of the golf zone. Although there are many ways to color this picture one of the best way is to start with the field and give it green color.
Color all plants, trees and the grass with green color. Make the wood part of the trees brown as that is the right color to use there.
The entire field is covered with grass so should of green color. In all the green plants and trees you can use few different shades of green.
After the field color the background of the picture with a light blue. Once done with everything else, come to the boy with the golf bat and use colors you like.